function menu(id){
	element=document.querySelector('#'+id);
	element.style.margin="auto";

	if(element.style.visibility=='visible'){
		element.style.visibility='hidden';
		element.style.height='0px';
		element.style.width='0px';
		element.style.margin="auto";
	}
	else{
		element.style.visibility='visible';
		element.style.height="auto";
		element.style.width="auto";
		element.style.color="red";
		element.style.margin="auto";
	}
}